How Can I Automate SSH Commands in Python?

Automating Commands over SSH with Python

When automating command-line tasks in Python, using subprocess.call() is a common approach. However, for remote machine commands that require SSH login, this method is insufficient.

Automating SSH Commands in Python

To automate SSH commands in Python, a recommended module is paramiko. It provides an interface for establishing SSH connections and executing commands securely.

Here's an example using paramiko:

<code class="python">import paramiko

ssh = paramiko.SSHClient()
ssh.connect(server, username=username, password=password)
ssh_stdin, ssh_stdout, ssh_stderr = ssh.exec_command(cmd_to_execute)</code>

This establishes an SSH connection to a remote server, specifying the server address, username, and password. Subsequently, the exec_command() method executes the desired command, capturing standard output and error streams.

In case of SSH key authentication, the following code snippet can be used:

<code class="python">import paramiko

k = paramiko.RSAKey.from_private_key_file(keyfilename)
# OR k = paramiko.DSSKey.from_private_key_file(keyfilename)

ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(hostname=host, username=user, pkey=k)</code>

By specifying the keyfilename containing the private key, this code initiates an SSH connection using key-based authentication.

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